PetraSim Examples: 3D Five-Spot Geothermal Injection and
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1. File menu click New In the Simulator Mode list select TOUGH2 In the Equation of State EOS list select EOS1 In the X Min box type 500 In the X Max box type 500 In the Y Max box type 500 In the Z Max box type 305 Click OK to close the dialog and create the model 00 Qv Ut d NP Edit Layers Before creating the mesh we must first define the model layers Layers in PetraSim define depth based boundaries that can provide a convenient way to manage multiple rock layers When the mesh is generated the layer boundary will become the boundary between cells and each layer can be divided into an arbitrary number of internal divisions these internal divisions will also become cell boundaries By default the model is created with a single layer To set the default layer 1 Inthe Tree View expand the Layers node and click Default 2 Onthe Edit menu click Properties 3 Inthe Cells box type 6 4 Click OK to save changes to the default layer Add Wells To add wells 1 Onthe Model menu click Add Well 2 In the Name box type Inject 3 Inthe Ordered Well Coordinates table type these values PetraSim Examples X Y Z 0 0 0 0 310 0 0 0 0 0 0 0 Click OK to create the well 5 Repeat this for the production well in the upper left corner Use the name ProdUL and the following coordinates X Y Z 500 0 500 0 310 0 500 0 500 0 0 0 6 Repeat this for the production w2. ag HUCIDESHEAD 403 Poyntz Avenue Suite B Manhattan KS 66502 USA 1 785 770 8511 www thunderheadeng com PetraSim Examples 3D Five Spot Geothermal Injection and Production 2010 Table of Contents 3D Five Spot Geothermal Production and Injection EOS1 sse eruca ECU i em Addl Well m gorge Edit Global Properties oet eo reet ve bres e AERE ATE EE mesure EE fuit Reese Edit Well FloW cct Edit SOlUtION Controls ea ia aE eaa Edit Otttput CODtrols eibi reb E e E a E beu Save and RUN isnan ER View 3D ReSUIES andea aa eese aaa deer Raa ed eer e LI EUR DI PetraSim Examples 3D Five Spot Geothermal Production and Injection EOS1 This example is another variation of the five spot example in the TOUGH2 User s Manual In this analysis we use a 3D mesh and model injection and production wells An image is added to the model to illustrate the surface of the earth The model represents 1 2 of the repeating five spot pattern Create a New Model This example will use EOS1 the equation of state module that models multi phase water and tracer The extent of the model will be 1000x500x305 meters This information can be entered using the New dialog To create the model On the
3. d Z type 6e 15 By default materials use linear relative permeability However for this simulation we will use Corey s Curves To specify the relative permeability for this material 1 Click Additional Material Data 2 Inthe Relative Permeability list click Corey s Curves 3 Click OK Click OK to save changes and exit the Material Data dialog Initial Conditions When specifying parameters such as initial conditions PetraSim uses a tiered system that allows cells to inherit values from the containing region regions from the containing layer and layers from the global defaults Once we set the default initial conditions these values will be used by all cells except those where we have explicitly set values Correct specification of initial conditions is essential for simulation convergence The initial conditions must be physically meaningful Often this requires an initial state analysis in which a model is run to obtain initial equilibrium conditions before the analysis of interest geothermal production VOC spill etc is run However in 2D models with no pressure gradient such as this this process is simplified somewhat To set the global initial conditions On the Properties menu click Initial Conditions In the EOS1 list select Two Phase T Sg In the Temperature box type 300 In the Gas Saturation box type 0 01 E wN e PetraSim Examples 5 Click OK to save changes and exit the dialog Selecting a two p
4. ell in the upper right corner Use the name ProdUR and the following coordinates X Y Z 500 0 500 0 310 0 500 0 500 0 0 0 Create Mesh To create a polygonal Voronoi mesh On the Model menu click Create Mesh For Mesh Type select Polygonal In the Maximum Cell Area box type 2500 In the Max Area Near Wells box type 250 Click OK to create the mesh EE ci Your mesh should be refined near the wells Figure 1 F PetraSim CAPetraSim 2010 Examples 3D Five Spot 3d five spot wells sim File Edit Model Properties Analysis Results View Help amp eigIxIDajemcomo mu amp Layers Named Print ExtraCells Model Bal lt k X amp amp amp 4 Xf amp s es e amp 8 cet color By Layer Cell Count 1278 Figure 1 3D Five Spot model PetraSim Examples Edit Global Properties Global properties apply to the entire model In this example the only item to change is the analysis name To set the simulation name 1 On the Properties menu click Global Properties 2 Inthe Name box type 3D Five Spot Production and Injection 3 Click OK Edit Materials This simulation will require only one material To specify material properties 1 On the Properties menu click Edit Materials 2 Inthe Name box type POMED 3 Inthe Density box type 2650 0 4 Inthe Porosity box type 0 01 5 Inthe two Permeability boxes XY an
5. hase initial state with very little gas saturation is an appropriate simplification for this geothermal analysis Since we have only one element in the vertical direction we have selected a temperature of 300 C as a typical for this reservoir The pressure will be calculated by the equation of state to correspond to the small gas saturation Having all cells in a two phase state will also reduce the number of state transitions two phase to single phase or single phase to two phase that make convergence more difficult Edit Well Flow Rates To define the injection rate 1 oN OM 5 p In the Tree View right click on the Inject well and click Properties On the Geometry tab in the Top Completion Depth box type 305 0 and in the Bottom Completion Depth box type 100 0 This means that only the range 100 lt Z lt 305 is open for injection On the Flow tab in the Injection section select the Water Steam check box In the Rate box type 15 0 In the Enthalpy box type 50000 corresponding to about 6 C Click the Print Options tab Click to select the Print Time Dependent Flow and Generation Data check box Click OK to save changes and close the dialog Define the production wells using the Productivity Index 1 8 In the Tree View right click on the ProdUL well and click Properties On the Geometry tab in the Top Completion Depth box type 100 0 and in the Bottom Completion Depth box type 0 0 This means that on
6. ly the range O lt Z lt 100 is open for production On the Flow tab in the Production section select the Well on Deliv check box In the Productivity Index box type 2 0E 12 based on calculation described in the TOUGH2 User Manual In the Pressure box type 8 6E6 For the Gradient select the Well Model check box this means that TOUGH2 will use the density to calculate the pressure gradient in the well above the specified bottom pressure Click the Print Options tab and click to select the Print Time Dependent Flow and Generation Data check box Click OK to save changes and close the dialog Repeat with the same input for the well in the upper right corner using the name ProdUR Edit Solution Controls Parameters relating to the solver and time stepping can be found in the Solution Controls dialog PetraSim Examples To specify the simulation end time 1 On the Analysis menu click Solution Controls 2 Inthe End Time list click User Defined and type 36 5 years 3 Click OK Edit Output Controls By default the simulation will print output every 100 time steps For this simulation we will specify output every 5 time steps To specify the output frequency 1 On the Analysis menu click Output Controls 2 Inthe Print and Plot Every Steps box type 5 3 Click OK Save and Run The input is complete and you can run the simulation Save your model and run the simulation 1 On the Analysis menu click Run TOUGH2 The Simulatio
7. n Complete dialog will notify you when the end time has been reached Click OK to dismiss the notification and click Close to exit the Running TOUGH2 dialog View 3D Results To open the 3D Results dialog 1 On the Results menu click 3D Results By default the display will show isosurfaces corresponding to pressure for the first output step To show temperature isosurfaces for the last time step 1 Inthe Scalar list click T 2 Inthe Time s list click the last entry t 1 15183E9 To show scalar data on a slice plane Click Slice Planes In the Axis list click Z and in the Coord box type 1 In the Axis list click X and in the Coord box type 0 In the Axis list click Y and in the Coord box type 500 Click Close Uro e wm op The resulting visualization is Shown below PetraSim Examples E 30 Results lelak File Results View Time s 61582507 E 1 27118E08 2 45083E08 3 76155608 5 072708 6 64514E08 9 26658E08 soaua 500 0 0 0 FLOH W per m SA V Show Isosurfaces Scalar Inject 6 Scalar Properties a I E Show Vectors Vector Scale 0 1 10 0 Vector Size Range operties V Show Slice Planes 500 0 0 0 305 0 Figure 2 3D Five Spot temperature isosurfaces at end of solution When finished you can close the 3D Results dialog Importing the SAVE data into the model makes it possible to display results by cell FA Petra
8. sim CAPetraSim 2010 Examples 3D Five Spot 3d five spot wells sim lelak File Edit Model Properties Analysis Results View Help amp eg x nma jegoomoj ur 8 Wm Bal d Be Efe s m e S Eca color temperature Internal Boundari m W E Materials amp Wells Produ A Produr A Inject amp Named Print Cells ProdUR 0 ProduL 0 ProdUR 1 ProdUL 1 Inject 0 ProdUR 2 ProdUL 2 Inject 1 Inject 2 Inject 3 ExtraCells lt gt X E E PBOGUR 500 0 0 Cell Count 1278 TOUGH EOS1 Figure 3 Temperature display by cell
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